Hydraulic press.



No. 796,758. PATENTED AUG. 8, 1905.

0. PHILIPP.

HYDRAULIC PRESS. APPLIOATION FILED JULY 12,1904.

ANDREW. a. anmm c0" mm'mumdanvntu. WASHINGTON o. c

UNITED STATES PATENT OFFICE.

HYDRAULIC PRESS.

Specification of Letters Patent.

Patented Aug. 8, 1 905.

' Application filed Jul 12,1904. Serial No. 216,269.

T0 on whom it may concern:

Be it known that I, OTTo PHILIPP, a citizen of the Empire of Germany, residing in Naumburgon-the-Saale,in the Empire of Germany, have'invented certain new and useful Improvements in Hydraulic Presses, of which the following is a specification.

Hydraulic presses have been heretofore made in which the pressure fluid acts on an elastic membrane, which forces the sheetmetal blank into the matrix so as to impart the required shape to the same. These presses can be designated as membrane-presses,so as to differentiate them from the ordinary hydraulic presses. These membrane-presses were heretofore constructed in the same manner as-the ordinary hydraulic presses and were composed of a large number of individual parts.

The object of this invention is to supply an improved press of the membrane type, which combines a high degree of efficiency with sim' plicity of construction, and which consists of a cup-shaped casing, a closing-piece for said casing, a box in. said casing, a matrix supported in said box, an elastic membrane, a

plate for holding-the membrane in position provided with radial wing-plates, means for holding the plate on the matrix-box, a cylinder for the pressure fluid,'a plunger in said cylinder, and channels connecting the presscylinder with the space around the pressureplate and with the space between the same and the membrane, so as to expand the latter and-produce the pressure on the article to be shaped.

The invention consists, further, of certain additional details of construction and combinations of parts, which will be fullydescribed hereinafter and .finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a vertical central section through myimp'roved hydraulic press, and Fig. 2 is a detail face view of the membrane-holding plate shown as detached from the press.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, (0 represents the cup-shaped casing of my improved hydraulic press. The casing a is preferably made of cast-steel and provided at its rear part with a cylindrical interiorly threaded opening Z), into which an exteriorly-threaded closingpiece d is inserted so as to support at the interior of the casing a a box-shaped frame e, in

which a matrix m, which is preferably made of so-callcd Spence metal, is inserted. The inner walls of the casing a and the adjacent outer walls of the box-shaped frame a are made slightly tapering, so that the box-shaped frame is firmly retained in the casing when the closing-piece (Z is screwed home into the casing a. At some distance in front of the matrix m is arranged the cylinder f for the;

pressure fluid. In the cylinder f is guided a plunger f'. of slightly less diameter thanthe press-cylinder f, said plunger receiving vertically-reciprocating motion by any suitable mechanism. The pressure fluid in the cylinder f is conducted on the descent of the plunger f through a channel f into the space between the matrix m and the cylinder f. An elastic membrane his placed over the matrix on, so as to extend over the same and the edge. of the box-shaped frame 6. The elastic membrane/z is retained in position on the face of the matrix m and frame 6 by a plate 2', which so as to permit introduction of the plate 2' and the screwlng on of the segmental wings. a

through the opening 6 in the casing before the introduction of the elastic membrane into the space in front of the box-shaped frame and matrix.

The fluid-cylinder f and the adjacent wall of the casing a are provided with a lateral channel or bore 0, the inner end of which is screw-threaded and provided with a hollow pressure-screw 0, into which a key is inserted for setting the screw on the plate a and holding it with its wings 2" against the outer, portion of the membrane it, so that the latter is maintained by pressure upon the matrixholding frame 0. The outer end of the channel or bore 0 is closed by a gasket and shouldered plate Z, which is tightly held in position by fastening-bolts Z and screw-nuts Z as shown. On removing the plate Z the screwing or unscrewing of the screw-nut 0 can be readily accomplished by inserting a key through the channel 0 after the plunger f has been withdrawn into the upper part of the fluid-cylinder f. A shoulder Z is located at the inner face of the plate Z and acts on a packing ring or gasket Z which is interposed between said shouldered plate Z and a shoulder Z on the main portion or casing a, as shown in the left-hand side of Fig.1. The

sheet-metal blank 77/, which is to be pressed into shape by the hydraulic pressure on the membrane it, is interposed between the membrane and a recess in the face of the matrix.

My improved hydraulic press is operated as follows: The closing-piece d is unscrewed, so that access is given to the interior of the press. The matrix m and its frame 0 are re-' moved. The blank to be pressed into shape is first bent into a shape approximating the desired shape and is then applied to the matrix by means of a thin layer of wax w, interposed between the two adjacent surfaces of the matrix and blank, by which the latter is caused to adhere to the former, which is then reinserted into the casing a, with its box-frame c, by screwing home the closing-piece 65 into the opening in the rear part of the casing. The plunger f is then lowered and the pressure fluid passes through the channel f and enters the space between the plate and the membrane it, through the rectangular spaces between the wing-plates i, so as to force the membrane against the blank and the latter against the matrix, thereby imparting the final shape to the blank. High pressure can be applied by the press for the reason that the casing is made of one solid piece in which the matrix-holding frame is rigidly held, so that neither the box-shaped frame nor the matrix can give in any direction, and consequently the elastic membrane can be forced with a much higher pressure against the blank on the matrix. After the blank has been pressed into shape the closing-piece cl is again unscrewed and removed, the box-shaped frame with the matrix removedthrough the opening in the casing, a new blank placed in position on the matrix and the matrix-containing box and matrix replaced in' position in the casing, when by the next descent of the plungerthe next pressure action takes place, and so on.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent 1. A hydraulic press, consisting of a casing provided with an opening in its rear portion, a box-shaped frame in said casing, a matrix supported in said box-shaped frame, a closingpiece screwed into the opening of the casing for holding the box-shaped frame, an elastic membrane in front of the matrix and boxshaped frame, a pressure-plate extending over the outer portions of the membrane, a cylinder for the pressure fluid adjacent to the pressure-plate, a plunger in said cylinder, and means for firmly holding the pressure-plate and membrane in position in the casing.

2. A hydraulic press, cons i -"1g of a casing provided with an opening i its rear portion, a box-shaped framein scasing, a matrix supported in said box-sh .d frame, a closingpiece screwed into the 1 r portion of the casing for holding th box aped frame, an elas-Q In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

OTTO PHILIPP. Witnesses:

Cum 0. SPRENGER,

RUDOLPH FRICKE. 

